A communication system according to the present disclosure includes a first communication unit that includes a first terminal, a transmission circuit configured to transmit a clock signal via the first terminal, a first resistor inserted into a path between the first terminal and a power supply, a first switch configured to couple the power supply and the first terminal to each other by being turned on, and a first controller configured to control an operation of the first switch, and a second communication unit that includes a second terminal coupled to the first terminal of the first communication unit via a first wiring line, a reception circuit configured to receive the clock signal via the second terminal, a power storage device, a second switch configured to couple the second terminal and the power storage device to each other by being turned on, and a second controller configured to control an operation of the second switch, the second communication unit being configured to operate by supply of a voltage of the power storage device as a power supply voltage.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A communication system comprising: a first communication unit including a first terminal, a transmission circuit configured to transmit a clock signal via the first terminal, a first resistor inserted into a path between the first terminal and a power supply, a first switch configured to couple the power supply and the first terminal to each other by being turned on, and a first controller configured to control an operation of the first switch; and a second communication unit including a second terminal coupled to the first terminal of the first communication unit via a first wiring line, a reception circuit configured to receive the clock signal via the second terminal and through the first wiring line, a power storage device, a second switch configured to couple the second terminal and the power storage device to each other by being turned on, and a second controller configured to control an operation of the second switch, the second communication unit being configured to operate by supply of a voltage of the power storage device as a power supply voltage, wherein the first controller is configured to turn off the first switch during a communication period in which the first communication circuit transmits and receives data information included in the data signal and to turn on the first switch during a first period within a period other than the communication period.
2. The communication system according to claim 1 , wherein the first communication unit further includes a third terminal, a first communication circuit configured to transmit and receive a data signal via the third terminal, and a second resistor inserted into a path between the third terminal and the power supply, the second communication unit further includes a fourth terminal coupled to the third terminal of the first communication unit via a second wiring line, and a second communication circuit configured to transmit and receive the data signal via the fourth terminal.
3. The communication system according to claim 2 , wherein the first controller is configured to change a state of the first switch from an on state to an off state at a first timing before the transmission circuit starts to transmit the clock signal.
4. The communication system according to claim 2 , wherein the first controller is configured to change a state of the first switch from an off state to an on state at a second timing after the transmission circuit completes a transmission of the clock signal.
5. The communication system according to claim 2 , wherein the first communication circuit makes the data signal transition before the transmission circuit starts to transmit the clock signal, and the first controller changes a state of the first switch from an on state to an off state on a basis of the data signal and the clock signal before the transmission circuit starts to transmit the clock signal.
6. The communication system according to claim 2 , wherein the first communication circuit makes the data signal transition after the transmission circuit completes a transmission of the clock signal, and the first controller changes a state of the first switch from an off state to an on state on a basis of the data signal and the clock signal after the transmission circuit completes the transmission of the clock signal.
7. The communication system according to claim 2 , wherein the first communication circuit makes the data signal transition before the transmission circuit starts to transmit the clock signal, and the second controller changes a state of the second switch from an on state to an off state on a basis of the data signal and the clock signal before the transmission circuit starts to transmit the clock signal.
8. The communication system according to claim 2 , wherein the first communication circuit makes the data signal transition after the transmission circuit completes a transmission of the clock signal, and the second controller changes a state of the second switch from an off state to an on state on a basis of the data signal and the clock signal after the transmission circuit completes the transmission of the clock signal.
9. A communication unit comprising: a first terminal and a second terminal; a transmission circuit configured to transmit a clock signal via the first terminal; a first resistor inserted into a path between the first terminal and a power supply; a first switch configured to couple the power supply and the first terminal to each other by being turned on; a first controller configured to control an operation of the first switch; a communication circuit configured to transmit and receive a data signal via the second terminal, and a second resistor inserted into a path between the second terminal and the power supply, wherein the controller is configured to turn off the first switch during a communication period in which the communication circuit transmits and receives data information included in the data signal and to turn on the first switch during a first period within a period other than the communication period.
10. The communication unit according to claim 9 , wherein the controller is configured to change a state of the first switch from an on state to an off state at a first timing before the transmission circuit starts to transmit the clock signal.
11. The communication unit according to claim 9 , wherein the controller is configured to change a state of the first switch from an off state to an on state at a second timing after the transmission circuit completes a transmission of the clock signal.
12. The communication unit according to claim 9 , wherein the communication circuit makes the data signal transition before the transmission circuit starts to transmit the clock signal, and the controller changes a state of the first switch from an on state to an off state on a basis of the data signal and the clock signal before the transmission circuit starts to transmit the clock signal.
13. The communication unit according to claim 9 , wherein the communication circuit makes the data signal transition after the transmission circuit completes a transmission of the clock signal, and the controller changes a state of the first switch from an off state to an on state on a basis of the data signal and the clock signal after the transmission circuit completes the transmission of the clock signal.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 1, 2018
November 23, 2021
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